Phid 412 (Self-assessment For Quiz 1) . Kats
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Questions and Answers
- 1.
A thermostatic steam trap can be used both as vent and drip.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
A thermostatic steam trap is designed to automatically discharge condensate from steam systems. It operates based on the temperature difference between steam and condensate. When steam enters the trap, the thermostatic element expands and opens the trap, allowing condensate to be discharged. This mechanism also allows the trap to act as a vent, as it can release air and other non-condensable gases from the system. Therefore, a thermostatic steam trap can indeed be used both as a vent and a drip.Rate this question:
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- 2.
Ammonia gas has the highest latent heat among common refrigerants (296) coloring
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Ammonia gas has the highest latent heat among common refrigerants. This means that it requires the highest amount of energy to change its state from a gas to a liquid, and vice versa. This property makes it an efficient refrigerant as it can absorb and release a significant amount of heat during the refrigeration cycle. Other common refrigerants such as R-134a or R-410a have lower latent heats compared to ammonia. Therefore, the statement "Ammonia gas has the highest latent heat among common refrigerants" is true.Rate this question:
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- 3.
Brine is a concentrated salt solution
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Brine is a concentrated salt solution because it is made by dissolving a large amount of salt in water. This results in a solution with a high concentration of salt, which is commonly used for pickling and preserving food.Rate this question:
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- 4.
For in walls the outer temp is (tnt1).
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The given correct answer is "True". This means that for in walls, the outer temperature is equal to (tnt1). This implies that the temperature on the outer side of the walls is the same as the value represented by (tnt1).Rate this question:
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- 5.
Fourier's equation expressed condition only.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Fourier's equation is a mathematical expression that describes the conduction of heat in a solid material. It states that the rate of heat transfer is directly proportional to the temperature gradient and the cross-sectional area, and inversely proportional to the material's thermal conductivity. Therefore, Fourier's equation expresses a condition or relationship between these variables. Hence, the given statement that Fourier's equation expressed condition only is true.Rate this question:
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- 6.
Heat sources can be either directly or indirectly.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is stating that heat sources can be either directly or indirectly, meaning that heat can be generated either directly from the source or indirectly through a medium. This is a true statement as heat can be produced through various means such as burning fuel directly or through the use of heating systems that transfer heat indirectly through convection or radiation.Rate this question:
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- 7.
Mechanical stem traps are more capable than thermo static ones to drain large amounts of condensate.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Mechanical stem traps are designed to handle high condensate loads and are more efficient in draining large amounts of condensate compared to thermo static traps. This is because mechanical stem traps use a float and lever mechanism to open and close the valve, allowing for better control and drainage of condensate. Thermo static traps, on the other hand, rely on the difference in temperature between the condensate and steam to open and close the valve, making them less effective in handling high condensate loads. Therefore, the statement is true.Rate this question:
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- 8.
Mechanical stem traps depend on buoyancy while thermostatic ones depend on in temperature.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Mechanical stem traps rely on buoyancy to operate. These traps work by using a float mechanism that rises and falls with the condensate level. When the condensate level is high, the float rises and opens the trap, allowing the condensate to drain. On the other hand, thermostatic traps operate based on temperature. They have a bimetallic element that expands and contracts with temperature changes. When the condensate is hot, the element expands and opens the trap, and when it cools down, the element contracts and closes the trap. Therefore, the statement that mechanical stem traps depend on buoyancy while thermostatic ones depend on temperature is true.Rate this question:
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- 9.
Plate heat exchangers can be used for multiple day time
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Plate heat exchangers can indeed be used for multiple day time. Plate heat exchangers are devices that transfer heat between two fluids without mixing them. They consist of multiple plates with a large surface area, which allows for efficient heat transfer. These heat exchangers are commonly used in various industries, including HVAC systems, refrigeration, and chemical processing. They are versatile and can handle a wide range of temperatures and pressures, making them suitable for continuous operation over extended periods of time. Thus, the statement "Plate heat exchangers can be used for multiple day time" is true.Rate this question:
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- 10.
Specific heat is heat required to raise the temp of unit mass unit degree.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is true because specific heat refers to the amount of heat energy required to raise the temperature of a given substance by a certain amount. It is defined as the heat energy required to raise the temperature of one unit mass of a substance by one degree. Therefore, the given statement accurately describes the concept of specific heat.Rate this question:
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- 11.
Steam travels at a speed of a mile per a minute.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Steam traveling at a speed of a mile per minute is a factual statement. This means that steam can cover a distance of one mile in one minute.Rate this question:
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- 12.
The pressure inside the evaporator is lower than inside the condenser
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The pressure inside the evaporator is lower than inside the condenser because the evaporator is responsible for absorbing heat from the surroundings, which causes the refrigerant to evaporate and thus decrease the pressure. On the other hand, the condenser is responsible for releasing heat to the surroundings, causing the refrigerant to condense and increase the pressure. Therefore, it is true that the pressure inside the evaporator is lower than inside the condenser.Rate this question:
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- 13.
The pressure regulator serves to reduce the volume of refrigerant flowing to the evaporator.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The pressure regulator is a device that controls the pressure of a fluid, in this case, the refrigerant, in a system. By reducing the volume of refrigerant flowing to the evaporator, the pressure regulator helps to maintain the desired pressure levels in the system. This is important because the evaporator needs a controlled amount of refrigerant to efficiently absorb heat from the surroundings and cool the space. Therefore, the statement "The pressure regulator serves to reduce the volume of refrigerant flowing to the evaporator" is true.Rate this question:
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- 14.
The size and cost of spiral heat exchanger is comparable or even less than that of tubular units.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement suggests that spiral heat exchangers are similar in size and cost to tubular units, or even cheaper. This means that spiral heat exchangers can provide a cost-effective alternative to tubular units while still achieving similar performance.Rate this question:
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- 15.
The thicker the lagging, the more saving in operating cost.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Thicker lagging provides better insulation, which helps to reduce heat loss. This leads to lower energy consumption and operating costs. Therefore, the statement is true.Rate this question:
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- 16.
Velocity of flow augments heat transfer by connection.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is true because when the velocity of flow increases, it enhances heat transfer by improving the convective heat transfer coefficient. This is due to the fact that higher flow velocities create more turbulence and increase the contact between the fluid and the surface, leading to a more efficient transfer of heat. Therefore, increasing the velocity of flow can significantly enhance the heat transfer process.Rate this question:
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- 17.
An evaporating still allows evaporation of thermo labile non-aqueous solution.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
An evaporating still is a device used to separate a solvent from a solution through the process of evaporation. It is designed to work at low temperatures to prevent the degradation of heat-sensitive or thermo labile substances. Therefore, it allows the evaporation of thermo labile non-aqueous solutions without causing any damage or degradation to the solute. This statement is true because an evaporating still is specifically designed for this purpose.Rate this question:
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- 18.
Boiling temperature affects negatively the stability of thermo labile substances during evaporation.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is true because boiling temperature can cause the degradation or decomposition of thermo labile substances during evaporation. Thermo labile substances are sensitive to heat, and when they are exposed to high temperatures during boiling, their chemical structure can be altered, leading to a loss of stability. Therefore, it is important to carefully control the boiling temperature to ensure the preservation of these substances during evaporation processes.Rate this question:
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- 19.
Boiling temperature affects solubility negatively, positively or fairly.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The boiling temperature of a solvent affects solubility positively. When the temperature of a solvent increases, the solubility of most solid solutes in that solvent also increases. This is because higher temperatures provide more energy for the solute particles to break apart and mix with the solvent particles, resulting in increased solubility. Therefore, the statement "Boiling temperature affects solubility positively" is correct.Rate this question:
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- 20.
Boiling temperature is indirect relative to solute concentration..
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The statement "Boiling temperature is indirect relative to solute concentration" is false. In reality, the boiling temperature is directly related to the solute concentration. When a solute is added to a solvent, it raises the boiling point of the solution. This is known as boiling point elevation. The presence of solute particles disrupts the intermolecular forces between solvent molecules, making it harder for them to escape into the gas phase. As a result, the boiling point of the solution increases compared to the pure solvent.Rate this question:
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- 21.
Evaporating pans are suitable for continuous operation.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Evaporating pans are designed to handle continuous operation, meaning they can continuously evaporate liquid without the need for frequent interruptions or downtime. This makes them suitable for industrial processes that require a continuous supply of evaporated material. The design and construction of evaporating pans ensure efficient heat transfer and evaporation, allowing them to operate for extended periods without any issues. Therefore, the statement "Evaporating pans are suitable for continuous operation" is true.Rate this question:
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- 22.
Evaporators are designed to give maximum heat transfer and minimum boundary layers.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Evaporators are designed to maximize heat transfer and minimize boundary layers. This means that they are specifically engineered to efficiently transfer heat from a liquid to a gas phase, while reducing the formation of stagnant layers of fluid near the heat transfer surface. By doing so, evaporators can achieve higher rates of heat transfer, making them more effective in various applications such as refrigeration systems or industrial processes.Rate this question:
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- 23.
Forced circulation evaporators can be operated under reduced pressure.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Forced circulation evaporators are designed to handle high-viscosity liquids or liquids with a high fouling tendency. These evaporators use a pump to circulate the liquid through the heat exchanger at a high velocity, which helps in preventing fouling and scaling. By operating under reduced pressure, the boiling point of the liquid is lowered, allowing for more efficient evaporation. This also reduces the risk of thermal degradation of the liquid. Therefore, forced circulation evaporators can indeed be operated under reduced pressure.Rate this question:
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- 24.
Higher moisture content may dictate a lower evaporating temperature.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
This statement is true because moisture content in the air affects the rate at which water can evaporate. When there is higher moisture content, the air is already saturated with water vapor, making it more difficult for additional water to evaporate. Therefore, a lower evaporating temperature is required to facilitate the evaporation process.Rate this question:
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- 25.
In film evaporators an increased heating surface to liquid ration is employed.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
An increased heating surface to liquid ratio is employed in film evaporators to enhance the efficiency of the evaporation process. This means that the heating surface area is larger compared to the volume of liquid being evaporated. By increasing the surface area available for heat transfer, more liquid can be evaporated in a shorter period of time. This allows for faster and more efficient evaporation, making the statement true.Rate this question:
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- 26.
In forced circulation evaporate most of the liquid is heated most of the time.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
In forced circulation, most of the liquid is heated most of the time. This means that the liquid is constantly being circulated and exposed to heat, allowing for efficient evaporation. Unlike natural circulation where the liquid is heated intermittently, forced circulation ensures a continuous heating process, resulting in the evaporation of most of the liquid. Therefore, the statement is true.Rate this question:
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- 27.
Insulin extract can be safely evaporated in climbing film evaporator
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Insulin extract can be safely evaporated in a climbing film evaporator because this type of evaporator allows for efficient and controlled evaporation of liquids. The climbing film evaporator operates by creating a thin film of liquid on the inner surface of the evaporator tubes, which enhances heat transfer and minimizes the risk of overheating or degradation of the insulin extract. This method ensures that the evaporation process is safe and preserves the quality and effectiveness of the insulin extract.Rate this question:
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- 28.
Practically, evaporation is removal of liquid from solution by boiling, leaving a solid residue.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Evaporation is not the removal of liquid from a solution by boiling, but rather the process by which a liquid turns into a gas, typically due to an increase in temperature. It does not leave a solid residue behind. Therefore, the statement is false.Rate this question:
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- 29.
Solute concentration increases viscosity or evaporating solution both directly by increasing boiling temperature.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is true because solute concentration does indeed increase viscosity and boiling temperature of a solution. When solute particles are added to a solvent, they disrupt the flow of the solvent molecules, making it more difficult for them to move past each other, resulting in an increase in viscosity. Additionally, the presence of solute particles in a solution raises the boiling point of the solution, as the solute particles create an additional obstacle for the solvent molecules to overcome in order to vaporize. Therefore, both viscosity and boiling temperature are directly influenced by the increase in solute concentration.Rate this question:
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- 30.
Solute concentration is in direct relation to both boiling temperature and viscosity.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is true because solute concentration affects the boiling temperature and viscosity of a solution. When the solute concentration increases, the boiling temperature also increases because the solute particles interfere with the vaporization process. Similarly, the viscosity of a solution increases with higher solute concentration as the solute particles hinder the flow of the solvent. Therefore, solute concentration directly influences both boiling temperature and viscosity.Rate this question:
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- 31.
The caldaria evaporator is identically a vertical tube evaporator.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement suggests that the caldaria evaporator is indeed a vertical tube evaporator. This means that the caldaria evaporator follows the design and functions of a vertical tube evaporator, which typically consists of a vertical tube bundle where the liquid to be evaporated is heated and vaporized. Therefore, the answer "True" indicates that the given statement is correct and the caldaria evaporator can be classified as a vertical tube evaporator.Rate this question:
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- 32.
Theoretically, evaporation means vaporization at a very low temperature for a very short time.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Evaporation refers to the process of liquid turning into vapor. The statement correctly explains that evaporation occurs at a low temperature and for a short duration. This aligns with the scientific understanding of evaporation, where the liquid molecules gain enough energy to escape into the gas phase, but without reaching the boiling point. Therefore, the statement is true.Rate this question:
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- 33.
The melabile drugs should be evaporated at every low temperature for a very short time.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
The statement is suggesting that melabile drugs should be evaporated at low temperatures for a short duration. This is likely true because melabile drugs are typically sensitive to heat and can easily degrade or lose their effectiveness when exposed to high temperatures for extended periods. Therefore, evaporating them at low temperatures for a short time would help preserve their chemical integrity and therapeutic properties.Rate this question:
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- 34.
Triple effect vertical evaporators save heating cost and increases evaporating rate.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Triple effect vertical evaporators save heating cost and increase evaporating rate because they utilize the heat from the previous effect to heat the next effect, thus reducing the amount of external heat required. This increases the overall efficiency of the evaporation process and reduces the energy consumption, resulting in cost savings. Additionally, the multiple effects allow for a higher evaporation rate as the product is exposed to multiple stages of heating and concentration. Therefore, the statement is true.Rate this question:
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- 35.
Viscous and crystal depositing solution can suitably be evaporated in vertical tube evaporators
- A.
True
- B.
False
- C.
Mixed
Correct Answer
A. TrueExplanation
Viscous and crystal depositing solutions can be effectively evaporated in vertical tube evaporators due to their design and operation. Vertical tube evaporators have a high surface area for evaporation and efficient heat transfer, making them ideal for handling viscous and crystal depositing solutions. The vertical orientation allows for easy separation of the concentrated solution and the crystals or solids that may form during evaporation. Additionally, the design of vertical tube evaporators ensures proper circulation and flow of the solution, preventing clogging and ensuring continuous operation. Therefore, it is true that vertical tube evaporators are suitable for evaporating viscous and crystal depositing solutions.Rate this question:
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- 36.
A 1:1 heat exchanger has one baffle in each of the two tube heads..
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
A 1:1 heat exchanger does not have one baffle in each of the two tube heads. This statement is false because a 1:1 heat exchanger has one baffle in one tube head and no baffle in the other tube head.Rate this question:
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- 37.
A 1:1 heat exchanger is affixed head heat exchanger.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The statement "A 1:1 heat exchanger is affixed head heat exchanger" is false. A 1:1 heat exchanger refers to a heat exchanger where the heat transfer is equal on both the hot and cold sides. On the other hand, an affixed head heat exchanger is a type of heat exchanger where the shell is fixed and the tube bundle can be removed. These are two different types of heat exchangers, so the statement is incorrect.Rate this question:
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- 38.
A 1:1 heat exchanger is a floating head heat exchanger.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
A 1:1 heat exchanger is not a floating head heat exchanger. A 1:1 heat exchanger refers to a heat exchanger in which both the hot and cold fluids flow in a parallel arrangement, with each fluid having its own set of tubes. On the other hand, a floating head heat exchanger is a type of heat exchanger where one end of the shell is fixed while the other end is free to move, allowing for thermal expansion and contraction. Therefore, the statement that a 1:1 heat exchanger is a floating head heat exchanger is false.Rate this question:
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- 39.
Cork is a good logging material for steam tubes.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Cork is not a good logging material for steam tubes. Cork is a lightweight and porous material that is commonly used for insulation and sealing purposes due to its low thermal conductivity and ability to resist moisture. However, it is not suitable for use in steam tubes as it cannot withstand high temperatures and may degrade or even catch fire. Therefore, the statement is false.Rate this question:
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- 40.
Dry steam is steam that has been dried by suitable heat.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Dry steam is not steam that has been dried by suitable heat. In fact, dry steam is steam that is completely free of any liquid water droplets. It is formed when water is heated to its boiling point and all the liquid water is converted into steam. Therefore, the correct answer is False.Rate this question:
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- 41.
Finned tubes - exchangers offer higher heat transfer for viscous liquid than plate heat exchangers.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Plate heat exchangers actually offer higher heat transfer for viscous liquids compared to finned tubes. This is because plate heat exchangers have a larger surface area for heat transfer, allowing for more efficient heat exchange between the two fluids. The plates in a plate heat exchanger are corrugated, which creates turbulence and enhances heat transfer. On the other hand, finned tubes are more commonly used for air-to-fluid heat transfer applications. Therefore, the statement that finned tubes offer higher heat transfer for viscous liquids than plate heat exchangers is false.Rate this question:
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- 42.
H is expressed in btu/hr-ft-f (k) ft2.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The statement "H is expressed in btu/hr-ft-f (k) ft2" is false. The given expression is not a valid unit of measurement. It is likely a combination of different units or a typographical error. Therefore, the correct answer is false.Rate this question:
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- 43.
In the steam heated equipment meant the out let of the steam in lower than the inlet.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
In steam heated equipment, the outlet of the steam is not necessarily lower than the inlet. The direction of steam flow can vary depending on the design and purpose of the equipment. It is possible for the outlet to be at the same level or even higher than the inlet in some cases. Therefore, the statement is false.Rate this question:
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- 44.
In thin walled tubes when rl/r2 > 1.5 the rm is required
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
In thin-walled tubes, when the ratio of the inner radius (rl) to the outer radius (r2) is greater than 1.5, the requirement for rm (mean radius) is not necessary. Therefore, the statement "In thin walled tubes when rl/r2 > 1.5, the rm is required" is false.Rate this question:
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- 45.
Lagging is essential on the tube from the pressure regulator to the condenser.
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Lagging is not essential on the tube from the pressure regulator to the condenser. Lagging is typically used to insulate pipes and prevent heat loss or gain, but it is not necessary in this specific section of the tube.Rate this question:
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- 46.
Latent heat is expressed in calorie/g/c
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The statement that "Latent heat is expressed in calorie/g/c" is false. Latent heat is actually expressed in calories per gram (cal/g) or joules per gram (J/g). The "c" at the end of the statement is incorrect and does not represent any unit of measurement.Rate this question:
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- 47.
Psi = psig + psia
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The equation given, "Psi = psig + psia," is incorrect. The correct equation should be "Psi = psig - psia." The correct answer is False because the given equation is not accurate.Rate this question:
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- 48.
Q= A∆T/(B/X)
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The given equation A∆T/(B/X) is not true. The correct answer is False.Rate this question:
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- 49.
U = (1 / (1/nAl - 1/KA - 1/mA)
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
The equation provided is not mathematically correct. It seems to be an attempt to calculate a value for "u" using variables "nAl", "KA", and "mA". However, the equation is missing some necessary mathematical operations and parentheses. Therefore, the correct answer is False, as the equation is not valid.Rate this question:
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- 50.
Slight pressure variations can be tolerated by simple thermostatic steam traps
- A.
True
- B.
False
- C.
Mixed
Correct Answer
B. FalseExplanation
Simple thermostatic steam traps are not able to tolerate slight pressure variations. These traps are designed to operate within a specific pressure range, and any variations outside of this range can cause them to malfunction or fail. Therefore, the statement that slight pressure variations can be tolerated by simple thermostatic steam traps is false.Rate this question:
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